The temperature of a room is very different in different areas, especially during the heating phase. The time it takes for heat to distribute evenly depends on the ceiling height or the presence of niches and bay windows, for example, and can vary greatly. Therefore, do not set the offset until the room was constantly heated to the desired room temperatures for about 2 days so that the heat could be almost evenly distributed throughout the room:

Important:The temperature at the device itself can vary greatly because of fluctuations due to time of day, for example occasional exposure to sunlight or reduced ventilation, heating up of the device, etc. The deviation between the temperature at the device itself and the actual room temperature is therefore not constant. The offset cannot be used to take variable temperature fluctuations into account.

We recommend using FRITZ!DECT 440 as an external temperature sensor because you can position it at the most suitable place in the room to measure the temperature:

Note:Smart plugs, for example FRITZ!DECT 200 or a FRITZ!DECT Repeater, can also measure the temperature. Note, however, that sockets you have to plug these devices into are usually in unfavorable places for measuring the room temperature, for example in corners of rooms or near the floor. These areas of the room are usually unsuitable places to use external temperature sensors.